wng: fix two critical bugs
[paraslash.git] / write_common.c
1 /*
2 * Copyright (C) 2006 Andre Noll <maan@systemlinux.org>
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; either version 2 of the License, or
7 * (at your option) any later version.
8 *
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software
16 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111, USA.
17 */
18
19 /** \file write_common.c common functions of para_audiod and para_write */
20
21 #include "para.h"
22 #include "string.h"
23 #include "list.h"
24 #include "sched.h"
25 #include "write.h"
26 #include "error.h"
27
28 const char *writer_names[] ={WRITER_NAMES};
29 struct writer writers[NUM_SUPPORTED_WRITERS] = {WRITER_ARRAY};
30
31 static void wng_post_select(__a_unused struct sched *s, struct task *t)
32 {
33 struct writer_node_group *g = t->private_data;
34 int i;
35 size_t min_written = 0;
36
37 FOR_EACH_WRITER_NODE(i, g) {
38 struct writer_node *wn = &g->writer_nodes[i];
39 t->ret = wn->task.ret;
40 if (t->ret < 0)
41 return;
42 if (!i)
43 min_written = t->ret;
44 else
45 min_written = PARA_MIN(min_written, t->ret);
46 }
47 *g->loaded -= min_written;
48 if (!*g->loaded && *g->input_eof) {
49 g->eof = 1;
50 t->ret = -E_WNG_EOF;
51 } else
52 t->ret = 1;
53 if (*g->loaded && min_written)
54 memmove(g->buf, g->buf + min_written, *g->loaded);
55 }
56
57 int wng_open(struct writer_node_group *g)
58 {
59 int i, ret = 1;
60
61 PARA_NOTICE_LOG("opening wng %p with %d writer(s)\n", g, g->num_writers);
62 FOR_EACH_WRITER_NODE(i, g) {
63 struct writer_node *wn = &g->writer_nodes[i];
64 wn->wng = g;
65 ret = wn->writer->open(wn);
66 if (ret < 0)
67 goto out;
68 wn->chunk_bytes = ret;
69 g->max_chunk_bytes = PARA_MAX(g->max_chunk_bytes, ret);
70 PARA_DEBUG_LOG("pre_select: %p\n", &wn->writer->pre_select);
71 PARA_DEBUG_LOG("post_select: %p\n", &wn->writer->post_select);
72 wn->task.pre_select = wn->writer->pre_select;
73 wn->task.post_select = wn->writer->post_select;
74 wn->task.private_data = wn;
75 register_task(&wn->task);
76 }
77 sprintf(g->task.status, "%s", "writer node group");
78 g->eof = 0;
79 register_task(&g->task);
80 out:
81 return ret;
82 }
83
84 void wng_destroy(struct writer_node_group *g)
85 {
86 if (!g)
87 return;
88 free(g->written);
89 free(g->writer_nodes);
90 free(g);
91 }
92
93 void wng_close(struct writer_node_group *g)
94 {
95 int i;
96
97 if (!g)
98 return;
99 PARA_NOTICE_LOG("closing wng with %d writer(s)\n", g->num_writers);
100 FOR_EACH_WRITER_NODE(i, g) {
101 struct writer_node *wn = &g->writer_nodes[i];
102 unregister_task(&wn->task);
103 wn->writer->close(wn);
104 }
105 }
106
107 struct writer_node_group *wng_new(unsigned num_writers)
108 {
109 struct writer_node_group *g = para_calloc(sizeof(struct writer_node_group));
110 g->num_writers = num_writers;
111 g->writer_nodes = para_calloc(num_writers
112 * sizeof(struct writer_node));
113 g->written = para_calloc(num_writers * sizeof(size_t));
114 g->task.private_data = g;
115 g->task.post_select = wng_post_select;
116 g->task.flags = POST_ADD_TAIL;
117 return g;
118 }
119
120 void init_supported_writers(void)
121 {
122 int i;
123
124 FOR_EACH_WRITER(i)
125 writers[i].init(&writers[i]);
126 }
127
128 void *check_writer_arg(char *wa, int *writer_num)
129 {
130 int i;
131
132 *writer_num = -E_WRITE_COMMON_SYNTAX;
133 PARA_INFO_LOG("checking %s\n", wa);
134 FOR_EACH_WRITER(i) {
135 const char *name = writer_names[i];
136 size_t len = strlen(name);
137 char c;
138 if (strlen(wa) < len)
139 continue;
140 if (strncmp(name, wa, len))
141 continue;
142 c = wa[len];
143 if (c && c != ' ')
144 continue;
145 if (c && !writers[i].parse_config)
146 return NULL;
147 *writer_num = i;
148 return writers[i].parse_config(c? wa + len + 1 : "");
149 }
150 PARA_ERROR_LOG("%s", "writer not found\n");
151 return NULL;
152 }
153
154 struct writer_node_group *setup_default_wng(void)
155 {
156 struct writer_node_group *wng = wng_new(1);
157 enum writer_enum default_writer;
158
159 if (NUM_SUPPORTED_WRITERS == 1)
160 default_writer = FILE_WRITE;
161 else
162 default_writer = 1;
163 wng->writer_nodes[0].writer = &writers[default_writer];
164 sprintf(wng->writer_nodes[0].task.status, "%s",
165 writer_names[default_writer]);
166 PARA_INFO_LOG("using default writer: %s %p\n",
167 writer_names[default_writer], writers[default_writer].parse_config);
168 wng->writer_nodes[0].conf = writers[default_writer].parse_config("");
169 return wng;
170 }